public override void VisitAfter(BracketedPredicate predicate)
{
if (IsPlaceHolderPredicate(predicate.Operand))
{
predicate.Operand = Place((PlaceHolderPredicate)predicate.Operand);
}
}
/// <summary>
/// 論理式条件を追加する
/// </summary>
/// <param name="sqlExp"></param>
/// <remarks>
/// AddAndExpVisitorは走査対象にPredicate単体を指定された場合、
/// そのPredicateを置き換えることはできないので利用できなかった.
/// </remarks>
public SqlPredicate And(SqlPredicate predicate)
{
//predicateがNullの場合、処理を終了する
if (predicate == null || predicate.IsEmpty)
{
return(this);
}
else if (_predicate.GetType() == typeof(NullPredicate))
{
return(new SqlPredicate(predicate._predicate));
}
Predicate leftPredicate;
if (_predicate.GetType() == typeof(OrPredicate))
{
leftPredicate = new BracketedPredicate(_predicate);
}
else
{
leftPredicate = _predicate;
}
Predicate rightPredicate;
if (predicate._predicate.GetType() == typeof(OrPredicate))
{
rightPredicate = new BracketedPredicate(predicate._predicate);
}
else
{
rightPredicate = predicate._predicate;
}
// PlacedHoldersをマージする
Dictionary <string, INode> newPlacedHolders = null;
if (_placedHolders == null)
{
newPlacedHolders = predicate._placedHolders;
}
else if (predicate._placedHolders == null)
{
newPlacedHolders = _placedHolders;
}
else
{
foreach (var placedHolder in predicate._placedHolders)
{
if (!_placedHolders.ContainsKey(placedHolder.Key))
{
_placedHolders.Add(placedHolder.Key, placedHolder.Value);
}
}
}
return(new SqlPredicate(new AndPredicate(leftPredicate, rightPredicate), newPlacedHolders));
}
private Predicate AddPredicate(Predicate where)
{
//if(_predicate == null || _predicate.GetType() == typeof(NullPredicate)) {
if (_predicate == null)
{
// 空文字、又はnullであれば構文木に何もしない
return(where);
}
if (where == null)
{
where = _predicate;
}
else
{
Predicate leftPredicate;
//if(AddWherePredicateVisitor.IsAndOnlyPredicate(where)) {
// // AND連言の場合
// leftPredicate = where;
//} else {
// // AND連言でない場合はWhere句の式を括弧で囲んでAND節をつなげる
// leftPredicate = new BracketedPredicate(where);
//}
if (where.GetType() == typeof(OrPredicate))
{
// WHERE句が、A OR Bの場合(A OR B)のように括弧で囲む
leftPredicate = new BracketedPredicate(where);
}
else
{
// WHERE句が、A AND Bの場合またはAのように2項演算でない場合、括弧で囲まない
leftPredicate = where;
}
// 追加するPredicateがAND連言でない場合は括弧で囲む
Predicate rightPredicate;
//if(AddWherePredicateVisitor.IsAndOnlyPredicate(_predicate)) {
// rightPredicate = _predicate;
//} else {
// rightPredicate = new BracketedPredicate(_predicate);
//}
if (_predicate.GetType() == typeof(OrPredicate))
{
// OR演算式の場合は式全体を括弧で囲んでAND節をつなげる
rightPredicate = new BracketedPredicate(_predicate);
}
else
{
rightPredicate = _predicate;
}
where = new AndPredicate(leftPredicate, rightPredicate);
}
return(where);
}
private Predicate PlaceInCollate(PlaceHolderPredicate ph)
{
var predicate = this.Place(ph);
if (predicate.GetType() == typeof(AndPredicate) ||
predicate.GetType() == typeof(OrPredicate))
{
predicate = new BracketedPredicate(predicate);
}
return(predicate);
}
private Predicate PlaceInAnd(PlaceHolderPredicate ph)
{
var predicate = this.Place(ph);
if (predicate.GetType() == typeof(OrPredicate))
{
// OR演算式の場合は式全体を括弧で囲んでAND節をつなげる
predicate = new BracketedPredicate(predicate);
}
return(predicate);
}
virtual public void VisitAfter(BracketedPredicate predicate)
{
}
virtual public void VisitBefore(BracketedPredicate predicate)
{
}
public override void VisitAfter(BracketedPredicate predicate)
{
}
public override void VisitAfter(BracketedPredicate predicate)
{
--_predicateLevel;
}
public override void VisitBefore(BracketedPredicate predicate)
{
++_predicateLevel;
}
public void VisitAfter(BracketedPredicate predicate)
{
_visitor.VisitAfter(predicate);
}
public void VisitBefore(BracketedPredicate predicate)
{
_visitor.VisitBefore(predicate);
}